Study Zevachim folio 10A with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
With regard to one who slaughters an animal in order to sprinkle its blood for idol worship, or in order to burn its forbidden fat for idol worship, R' Yoḥanan says: Deriving benefit from the animal is prohibited, as it is considered an offering to idol worship, even if ultimately its blood was no
Reish Lakish says: Deriving benefit from the animal is permitted. One cannot have intention from one rite to affect another rite, and we do not derive halakhot applicable outside the Temple from halakhot that apply inside the Temple.
Although both disputes are essentially the same, each is necessary. And if the rabbis had taught us the dispute only with regard to that issue, namely, an animal slaughtered with idolatrous intent, one would have reasoned that Reish Lakish says his opinion only with regard to that issue, as he maint
And if the rabbis had taught us the dispute only with regard to this issue, namely, an offering that was slaughtered with the intention of sprinkling its blood not for its sake, one might claim that R' Yoḥanan says his opinion only with regard to this issue, which concerns halakhot applicable inside
When Rav Dimi came from Eretz Yisrael, he said: Rav Yirmeya responds to this dispute by eliciting evidence to support the opinion of R' Yoḥanan; and R' Ila elicits evidence to support the opinion of Reish Lakish.